body{
    background-color: lightgrey;
    margin: 0;
}
header{
    background-color: white;
}
header img{
    width: 100%;
}
nav{
    background-color: white;
    height: 40px;
}
nav ul{
    text-align: center;
}
nav ul li{
    display: inline-block;
    padding-left:2%;
    line-height: 40px;
}
nav ul li a{
    text-decoration: none;
}